Preparation of a TiNb2O7 Microsphere Using Formic Acid and Wrapping with Reduced Graphene Oxide for Anodes in Lithium Ion Batteries
- Preparation of a TiNb2O7 Microsphere Using Formic Acid and Wrapping with Reduced Graphene Oxide for Anodes in Lithium Ion Batteries
- 노한아; 최원창
- lithium ion battery; anode; titanium niobium oxide; formic acid; reduced graphene oxide
- Issue Date
- Journal of the Electrochemical Society
- VOL 163, NO 6, A1042-A1049
- Micron-sized TiNb2O7 (TNO), composed of nano-scaled primary particles, was synthesized using formic acid and a hydrothermal reaction. The TNO microsphere was optimized using formic acid and then wrapped with a graphene oxide (GO) layer using cetyltrimethylammonium bromide (CTAB) surfactants. It was then heat treated in a reducing atmosphere to yield a reduced graphene oxide-wrapped TNO microsphere (rGO-wrapped TNO microsphere) which exhibited superior rate capabilities and cyclability for anode materials in lithium ion batteries. In-depth electrochemical evaluations, including cyclic voltammetry and impedance studies, reveal that both rGO wrapping and the presence of a controlled TNO microsphere improve the electronic conductivity and lithium ion diffusivity of anodes.
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